Implication of the Change in Overturning Circulation to the LGM CO₂Budget
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Abstract
The observational proxy estimates suggest that the North Atlantic overturning stream function associated with the North Atlantic Deep Water (NADW) production and outflow was substantially weaker during the last glacial maximum (LGM) than that observed under present conditions. The impact of the changes in overturning circulation on the glacial carbon budget is investigated using a box model. The carbon box model reveals that the atmospheric CO2 concentration is more sensitive to change in the overturning circulation of the North Atlantic than that of the Southern Ocean, especially when North Atlantic overturning becomes weaker. For example, when the strength of the North Atlantic overturning circulation is halved, the atmospheric CO2 concentration is reduced by 50 ppm of that associated with the accumulation of CO2 in the deep ocean. This result implies that a weaker North Atlantic overturning circulation may play an important role in the lowering of LGM atmospheric CO2 concentration.
참고문헌 (43)
- "and C. Lorius. 1987. Vostok ice core provides 160000-year record of atmospheric CO₂. Nature", bar(la), pp.408~418
- "E.A. 1992. Cadmium and d13C paleochemical ocean distributions during the stage 2 glacial maximum. Ann. Rev. Earth Planet. Sci.", pp.245~287
- "E.A. and L. Keigwin. 1982. Deep circulation of the North Atlantic over the last 200", pp.000 784~787
- "E.A. and L. Keigwin. 1987. North Atlantic thermohaline circulation during the past 20 000 years linked to high-latitude surface temperature. Nature", pp.35~40
- "W.S. and T.-H. Peng. 1982. Tracers in the sea. Publication of Lamont-Doherty Geological Observatory", Columbia University
- "The sequence of events surrounding Termination II and their implications for the cause of glacial-interglacial CO2 changes", 13, pp.352~364 (1998)
- "W.B. and G.P. Lohman. 1982. Carbon isotope changes in benthic foraminifera from the western South Atlantic Reconstruction of glacial abyssal circulation patterns. Quat. Res.", pp.218~235
- "and N.J. Shackleton. 1988. Changes in distribution of d13C of deepwater CO₂between the last glaciation and the Holocene. Paleoceanography", pp.317~342
- "R.R. and J. Brown. 1994. The production of North Atlantic Deep Water", pp.12319~12341
- "and C. Pujol. 1980. Deep water formation in the North Atlantic ocean during the last ice age. Nature", pp.476~482
- "and N. Kallel. 1988. Deep water source variations during the last climatic cycle and their impact on the global deepwater circulation. Paleoceanography", pp.343~360
- "and J.-C. Dupplessy. 1994. A model study of the Atlantic thermohaline circulation during the last glacial maximum. Nature", pp.252~255
- "T.D. and E.C. Carmack. 1976. Frontal zone mixing and Antarctic Bottom Water formation in the southern Weddell Sea. Deep-Sea Res.", pp.301~317
- "Contribution of Southern Ocean surface-water stratification to low atmospheric CO2 concentrations during the last glacial period", 389, pp.929~935 (1997)
- "Improved estimates of global ocean circulation, heat transport and mixing from hydrographic data", 408, pp.453~457 (2000)
- "A.E. 1973. Circulation and bottom water production in the Weddell Sea. Deep-Sea Res.", pp.111~140
- "Intensified deep Pacific inflow and ventilation in Pleistocene glacial times.", 412, pp.809~812 (2001)
- "and K. Winn. 1991. Glacial pCO₂reduction by the world ocean experiments with the Hamburg carbon cycle model. Paleoceanography", pp.395~430
- "P.D. 1983. Deep convection in the world ocean. Rev. Geophys.", pp.1~26
- "A coupled climate model simulation of the Last Glacial Maximum, Part 2: approach to equilibrium", 20, pp.635~661 (2003)
- "F. and M.B. McElroy. 1984. Changes in atmospheric CO2 Influence of the marine biota at high latitude. J. Geophys. Res.", pp.4629~4637
- "and C.C. Langway. 1992. Carbon isotope compositions of atmospheric CO₂ during the last ice age from an Antarctic core. Nature", pp.488~490
- "and W.G. Spaulding. 1992. Glacial-to-interglacial variations in the carbon isotopic composition of atmospheric CO₂. Nature", pp.461~466
- "D.W. and R.G. Fairbanks. 1987. Variability in the deep and intermediate water circulation of the Atlantic Ocean during the past 25 Northern Hemisphere modulation of the Southern Ocean. Earth Planet. Sci. Lett.", pp.000 1~15
- "D.W. and Y. Rosenthal. 1994. Cd", Ca changes in deep Cape Basin core over the past 730 Response of circumpolar deepwater variability to northern hemisphere ice sheet melting, pp.paleocea(graphy), 000 661~675
- "Glacial deep water geochemistry: South Atlantic benthic foraminiferal Cd", Ca and 13C evidence, 2000, pp.15, 147~160
- "Circulation, mixing, and production of Antarctic Bottom Water", 43, pp.55~109 (1999)
- "On the origin and influence of Adelie Land bottom water", pp.151~171 (1998)
- "Reduced North Atlantic Deep Water flux to the glacial Southern Ocean inferred from neodymium isotope ratios", 405, pp.935~938 (2000)
- "J.L. and J.R. Toggweiler. 1984. A new model for the role of the ocean in determining atmospheric pCO₂. Nature", pp.621~624
- "and G. Ganssen. 1994. Changes in east Atlantic deep water circulation over the last 30", pp.000 209~269
- "W. and M.S. McCartney. 1993. On the North Atlantic circulation. Rev. Geophys.", pp.29~49
- "Modeling ocean-atmosphere carbon budgets during the Last Glacial Maximum-Heinrich 1 meltwater event-Bflling transition", 90, pp.412~425 (2001)
- "Jr. 1984. The stratification and water masses at Drake Passage. J. Geophys. Res.", pp.10489~10514
- "Glacial", interglacial variations in atmospheric carbon dioxide, 2000, pp.407, 859~869
- "The Southern Ocean limb of the global deep overturning circulation", 31, pp.143~173 (2001)
- "The influence of Antarctic sea ice on glacial-interglacial CO₂variations", 409, pp.171~174 (2000)
- "Variations of atmospheric CO₂by ventilation of the earth?s deepest water", 14, pp.571~588 (1999)
- "Effect of Drake Passage on the global thermohaline circulation", 42, pp.477~500 (1995)
- "B.A. 1981. Deep circulation of the world ocean. p. 6-41. In Evolution of Physical Oceanography. eds. by B.A. Warren and C. Wunsch. The MIT Press."
- "Simulated influence of carbon dioxide, oribital forcing and ice sheets on the climate of the last glacial maximum", 394, pp.847~853 (1998)
- "Water masses and mixing near the Antarctic Slope Front", pp.1~27 (1998)
- "Similar rates of modern and last-glacial ocean thermohaline circulation inferred from radiochemical data", 379, pp.689~694 (1996)
